Water-tube boiler



Feb. 10, 1931. 'J. KOLLING IATER TUBE BOILER Fua lay 13/1927 e Shoots-Sheet 1 W INVENTOR BY W ATTORNEYS Feb. 10, 1931. J; KDLLING wkrna was BOILER 6 Shoots-$11150: 2

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ATTORNEYS Patented Feb. 10,1931

.UNITED'STATES PATENT OFFICE JOE-ANN xemime, or DUISBURG, GERMANY, .ASSIGNOR TO man :BABcocx & wrncox v COMPANY, OF BAYONNE, NEW JERSEY, A coRroIm'rIoNoF mw JERSEY WATER-TUBE BOILER Applicationfiled May 1a, 1927, serial lq'o. 191,053, and in Germany May 31,- 1926'.

This invention relates to a water tube boiler having a furnace for burning powdered fuel so arranged that a long path is given to the mixture of powdered fuel and air in order to insure complete gasification and combustion of the powdered fuel without requiring an inordinateheight of the boiler. 'The invention will be understood a from the description in connection with the accompanying drawings, in which Fig. 1 is.

a vertical section through an illustrated embodiment of the invent-ion; Fig. 2 is a front elevation partly in section; Fig.3 is a section showing some of the details; Figs. 4 and 5 are views similar to Figs. 1 and 2 showing a modification; Fig. 5a is a section along the. line 5a5a of Fig. 1; and Fig. 6 is a view similar to Fig. 5 showing a second modifica tion. In the illustrations the boilers are shown as being made up of two boilers located above a single furnace, from which the hot products of combustion pass over the tubes of the respective boilers.

' In the drawings, reference character 10 in- I 1 above. A suitable closure, such as tile 29' for example, may beinstalledto fill the spaces 2 dicates a steam and water drum extending across the boiler, to which a steam drum 11 is connected by nipples 12.

. The several parts of the respective boilers are duplicated on each side of the furnace, and it will be necessary to describe only one of them. A pipe 13 leads from the drum 11 to the inlet header 14 of a superheater 14, that is made up of U-tubes of different lengths connecting the header 14' to. the outlet header' 14". in the V-shaped space between banks of tubes 15 .and 17 The bank of circulating tubes 15 connects the drum 10 to the uptake headers 16 and this bank of tubes is located atthe top of the furnace and extends entirely-across the boiler. The bank of inclined tubes 17 connects uptake headers 16 to the downtake headers 18. The .upper ends of headers ,18'

are connected by the nipples'19 to thewater space of the drum '10, and their loweFends are nippled to the cross mud drum 18. The bank of tubes 17 also extendsentirely. across the boiler. Some of the headers 16 near the side of the boiler extend downwardly sufli- 0U cient distances to have the upper ends of the The superheater is located them, and some of the headers 18 are extended downwardly for a similar purpose. A second bank of inclined tubes 21 of shorter rows than the tubes in the bank 20, are 10- cated'below the bank 20 and the ends thereof are expanded into headers near the side of the boiler. x

p A wall 24 is located between the cumbustion space of the boiler and the banks of the tubes 20 and 21. This wall is made up of inclined tubes'25 andtile 26, the tubes 25 being parallel-to the tubes 17, 20 and 21. The tubes 25 are expanded at their upper ends into headers 28 that are located in the same plane as the headers 16 at the rear ofthe' boiler,

and the front or lower-ends of the tubes 25 are expanded into similar headers 27 that are in the same plane as the headers 18. When it is desired to make the wall 24 inclined, the headers 28 are arranged in echelon, as most clearly shown in Fig. 3, with the upper ends of the lower headers 28 connected by nipples 29 to the lower ends of the headers 16 therebetween the nipples 29. The headers 16' and '28, together with the nipples 29 and the tile,

tween the wall 2 1 and the side wall of the boiler, and at right angles thereto.

' One or more rows of water tubes 32 extend across the lower port-ion of the-furnace from the drum 31 to the header 33, and a row of rear wall tubes 34 extends upwardly frdm the header 33 into the lower ends of the headers 16 and-28, these tubes being lined with tile to provide a solid wall at the rear of the furnace. ,Ash hoppers 35 are provided below the slag screen tubes 32.

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An air heater is located below the bank of tubes 21 in the space between the wall 24 and the side wall of the boiler This air heater comprises vertical tubes 36 expanded into upper and lower tube plates 37 and 38. A soot hopper 39 is located below the air heater and a waste gas outlet or conduit 40 leads from below the air heater to the rear of the boiler.

' I An air blower 41 is provided from which the conduit 42 leads to the air heater =36. The .furnace is extended forwardly of the front ends of the inclined tubes. A furnace arch 44 is provided at thefront and a row of fuel burners 45 extends through the arch 44.

In the modification shown in Figs. 4 and 5, the same, reference characters are used to refer to the parts already described in connection with Figs. 1 and 2. In this modification, the partition wall 24', is a vertical wall -made up of tubes 25 and tile 26'. The rear I or upper ends of the inclined tubes 25 and the lower or front ends of the same are connected to uptake and downtake headers to be 'described below. Also in this modification, the ash hopper walls are provided with water tubes and the water screen tubes that extend across the lower end of the furnace in Figs.

' land 2, are omitted in this modification.

- and 61 are located in the walls of the ash the furnace.

hopper and connect the headers 58 and 59 to the headers 62 and 63, respectively, which are preferably inclined. The headers 62 and 63 are connected to the steam space of the drum 10 by the tubes 64, header55 and nipples 56. In this modification, the rear wall of the furnace comprises inclined instead of vertical tubes, as shown in-the modification illustrated in Figs. 1 and 2. A tube 65 leads from the water space of the drum 10 to the upper end of the downtake header 66 that is divided into two sections, connected by a nipple. Inclined tubes 67 extend along the rear of the furnace from the header 66 to the uptake header 68 that is also divided into two sections connected by a nipple. These tubes are lined with tile to make a solid rear wall for A .tube 69 leads from the upper end of the header 68 to the steam and water drum 10. A tube 7 0 leads from the water space of the drum 10 to the inclinedheader 71 that is parallel to the tubes 67. A row of tubes 72 ex- 2 tends from the header 71 to the lower ends of the headers 16 and are lined with tile, thus completing the wall in the triangular space I between the tubes 67 and the headers 16.

wall 24 is made up of vertical tubes 25 lined with tile, these tubes extending from the header 62 at the upper edge of the ash hopper wall to a header 76 from which a tube 77 leads to the header 55.

The rear wall in this modification also differs from t e other illustrations of the invention. A tube 7 8 leads from the water pace of the steam and water drum 10 to the inclined header 79 located at the rear of the furnace. A row of vertical tubes 80 extends from the header 79 and is lined-with tile to form a solidwall at the rear of the furnace. The upper ends of the tubes 80 extend into a header 81 that is connected by a tube 82 to the drum 10. In this modification, a tube 63' similar to.the tube 64, shown in the modification illustrated in Figs. 4 and 5, extends outside of the furnace wall from the header 6 to thedrum 10. I

The operation is as follows: Fuel is introduced through the .burners 45 and the hot products of combustion pass in a generally U-shaped direction, asindicated by the arrows in Fig. 1 andv rising divide to the right and'left (Fig. 2), passing across the tubes 17 and superheater tubes. 14 over the upper edges of the walls 24 on each side of the combustion space prop-er of the furnace, thence downwardly over the tubes 17 that are near the sides of the boiler, thence downwardly across the tubes 20 and 21- and through the tubes36 of the air heater, and

24 passes downwardly from the downtake headers 18 into the headers 27, thence through the tubes 25 into the headers 28, and finally into the headers 16 and tubes 15 to the drum The air passes from the fan 41 through the conduit 42 into the air heater between the tube sheets 37 and 38 through the space between the tubes 36 and thence into the furnace, where it is mixed with the incoming fuel.

Inthe modification shown in Figs. 4- and 5, the water for the ash hopper wall tubes passes downwardly through the tubes 57 into the headers 58 and 59, thence upwardly through the rows-of tubes 60 and 61 into the I headers 62 and 63. It passes from the headers 62 and 63 to the tubes 64 and thence into the drum-10. The water for the rear wall tubes passes through the tube 65 into the header 66, thence upwardly through the inclinedtubes 67 to the header 68, thence through the tube 69 to the drum 10. The

water for the upper rear wall tubes passes from the tube 70 into. the header 71, thence through the tubes 72 into headers 16 and from thence into the tubes and drum 10. In the modification shown in Fig. 6, the water that passes through the ash hopper tubes 60 into the header 62, passes upwardly through the tubes 25" of the wall 24 thence through the tubes 7 7 into the header 55 and nipples 56 into the drum 1-0. The water that passes through the ash hopper wall tubes 61 passes into the header 63 and then passes through the tube 63 water that passes from the tube 78 into the lower header 79 at the rear of the furnace passes upwardly through the rear wall tubes 80 into the header 81, thence through the tube 82 into the drum 10. The flow of hot products of combustion and that of the air is similar in the modification shown in Figs. 4, 5 and 6 to that described in connection with Figs. 1 and 2. r

I claim:

1. A water tube boiler having a cross drum, uptake and downtake headers, inclined tubes connecting'said headers. horizontally disposed tubes connecting said uptake headers to said drum, nipples connecting said downtake headers to said drum, a deep furnace for pulverized fuel below the upper portions of said boiler, said inclined tubes being in two banks, one bank extending across the boiler setting below said circulating tubes, another bank extending below the first-named bank along the side of the boiler setting, a wall between said furnace and said last-named. bank of tubes, said wall comprising spaced tubes and tile filling the spaces between them, a furnace arch. means for firing said furnace downwardly through said arch at a point below the upper bank of inclined tubes, and an outlet conduit located below the bank of tubes that is along the side of the boiler setting whereby hot gases pass downwardly and then upwardly in said furnace, then twice across said first-named bank of inclined tubes and across said side bank of tubes to said outlet conduit 2. A water tube boiler having a cross drum, uptake and downtake headers, inclined tubes connecting said headers, horizontally disposed tubes connecting said uptake headers to said drum, nipples connecting said downtake headers to said .drum, a deep furnace for pulverized fuel below the upper portions of said. boiler, said inclined tubes being in two banks, one bank extending across the boiler setting below said circulating tubes, another bank extending below the firstnamed bank along the side of the boiler setting, a wall between saidfurnac'e and said last-named bank of tubes, said wall comprisinto the drum 10. The" is along the side of the boiler setting whereby hot gases pass downwardly and then upwardly in said furnace, then twice across said first-named bank of inclined tubes and across said side bank of tubes to said outlet conduit.

J OHANN KGLLING. 

